Audi A8 (4N_) TFSIe from MY 2019

WARNING: This page is about a different car, the 2024 Audi SQ7, 2024 Audi Q7, 2023 Audi SQ7, and 2023 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.

Vehicle	Required Adapters for the Connections to A/C Compressor	Necessary Adapter for the Connections to the Receiver/Dryer / for the Check Valves and Shut-Off Valves	Miscellaneous
Audi A8 (4N_) TFSIe from MY 2019 Vehicle with one evaporator	-- Compressor manufacturer "Sanden" (block connections with radial sealing) Low pressure side Refrigerant Circuits Adapter Set 1 - Adapter 12:VAS 6338/12 connected with the A/C Service Station and the Refrigerant Circuits Adapter Set - Adapter 48:VAS 6338/48 High pressure side: Refrigerant Circuits Adapter Set 1 - Adapter 3:VAS 6338/3	Receiver/Dryer-- No adapter required, dryer is removed from receiver/dryer on condenser and the opening is sealed.	The expansion valve is removed and Refrigerant Circuits Adapter Set 1 - Adapter 44:VAS 6338/44 is installed (or an old expansion valve is drilled on and installed as an adapter. Refer to PRELIMINARY WORK TO CLEAN REFRIGERANT CIRCUIT (FLUSHING WITH REFRIGERANT R1234YF) and the Parts Information.
		Check Valves-- The four check valves are removed and installed for the shut-off valves (:6338/47-1 and :6338/47-2 ) from the Shut-off Valves:6338/47 .	The shut-off valves installed for the check valves are opened or closed according to the area to be flushed. Refer to Refrigerant Circuit (vehicle-specific service information).
		Shut-off valve-- Remove the Refrigerant Shut-Off Valve Refrigerant Shut-Off Valve -V424- and install a Shut-off Valve:VAS 6338/42 for it.	Then open or close the shut-off valve installed for the shut-off valve according to the area to be flushed. Replace the Refrigerant Shut-Off Valve -V424- after flushing.

NOTE:

On the Audi A8 TFSIe, the refrigerant circuit is flushed in four steps (flushing cycles). Refer to Refrigerant Circuit (A/C System Refrigerant Circuit, Cleaning).

On the Audi A8 TFSIe, not only do the installed shut-off valves have to be in the correct position (open or closed), but also the electric valves (in the valve block) have to be in the correct position so that the entire refrigerant circuit can be flushed. The activation of the electric valves takes place via different routines, which are stored in the respective control module (for example, in the Thermal Management Control Module -J1024-) Refer to Refrigerant Circuit (A/C System Refrigerant Circuit, Cleaning).

To flush, the circuit on the Audi A8 TFSIe is divided into multiple sections and then cleaned respectively in a flushing cycle. The division takes place by activating the installed electrically activated valves and via the installed manually activated hand shut-off valves. Refer to Refrigerant Circuit (A/C System Refrigerant Circuit, Cleaning) Use the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.

The design of the different flushing circuits for the Audi A8 TFSIe is described in the vehicle-specific service information. Refer to Refrigerant Circuit (A/C System Refrigerant Circuit, Cleaning).

Condensers with an integrated receiver/dryer or dryer cartridge that cannot be replaced separately or is not available as a replacement part, the condenser must be replaced after flushing (with the dryer cartridge installed). Refer to Refrigerant Circuit (vehicle-specific service information) and the Parts Information.

After flushing, the refrigerant receiver on the heat exchanger for heat pump operation must be replaced. Refer to Refrigerant Circuit .

The Refrigerant Shut-Off Valve -V424- must be replaced after flushing. Refer to Refrigerant Circuit .